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Question

How much horizontal force must a girl apply to a 50.0 kg dresser to accelerate it at 0.40m/s2 along a horizontal surface if the force of friction is 70.0 N?

A
20.0 N
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B
70.0 N
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C
50.0 N
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D
80.0 N
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E
90.0 N
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Solution

The correct option is E 90.0 N
Given : m=50kg a=0.40 m/s2 f=70 N
Let the horizontal force to be applied be F.
ma=Ff
OR 50×0.4=F70 F=90.0 N

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